Support Control Frames #33
Description
At this point, the websockets server only expects to receive data frames (which come in "text" and "binary").
The currently defined control frames are ping, pong, and close. We should be able to both understand (and respond correctly to) these messages and to create them ourselves.
I'm concerned that responding to them correctly may complicate the flow of I/O from the websockets protocol portion to the application server.